Reply to Audio Setup Issue with Traktor S4 , speakers and amp. Need Help !!

So Im using the Kontrol S4 , my laptop and a big speaker ( I believe its a professional speaker) and an Amp. Now, I have the speaker connected to the amp via speaker wire and then the amp has an aux cable that is connected to the back of the Kontrol S4 ( Main Outputs) via a RCA to 3.5mm converter jack.

Whenever I play a track I can only hear the bass of the song , hence only the amp working on not the actual speaker ( in my opinion). Ive double checked the connections between the speaker and the amp and everything looks fine. But i may be wrong with my audio setup and output routing in the Traktor Pro 2 preferences. Could anyone please tell me the exact settings/wire setup that I have to use so that I can hear the whole track properly and not just the bass ??? I have a house party gig toevening and I need to find a solution to this problem.

If anyone can give me some advice or provide a solution to this problem that will be greatly appreciated !!. Thank you once again to those who can shed some light on this issue.